Message-ID:	<3544A5C8.412497C7@wpol.com>
From:	John Kissell <jdk AT wpol DOT com>
Reply-To:	jdk AT wpol DOT com
MIME-Version:	1.0
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: (none)
References:	<3 DOT 0 DOT 3 DOT 32 DOT 19980423122620 DOT 0068f068 AT ns DOT coba DOT net>
Lines:	21
Date:	Mon, 27 Apr 1998 00:25:18 GMT
NNTP-Posting-Host:	208.195.214.66
NNTP-Posting-Date:	Sun, 26 Apr 1998 20:25:18 EDT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

My bet is on Dist = a negative value! Put a printf in front of the sqrt
function to report 'Dist's actual value.


Daniel Delorme wrote:
> 
> I have this problem with SIGFPE...
> 
> double DistanceBetweenPoints(strPOINT *Pt1, strPOINT *Pt2)
> {
>   double Dist;
> 
>   Dist = pow(fixtof(Pt1->X - Pt2->X), 2)+
>          pow(fixtof(Pt1->X - Pt2->X), 2)+
>          pow(fixtof(Pt1->X - Pt2->X), 2);
>   Dist = sqrt(Dist);
>   printf("Dist = %f\n", Dist);  <----- program crashes here with SIGFPE
> }
> 
> traceback:
> _doprnt+3548
> _doprnt+1574
> printf+20
> DistanceBetweenPoints
> 
> and I #included math.h
> 
> Why would SIGFPE appear in a mere printf ?
> What causes SIGFPE anyway ?
> If I remove the printf, I get SIGFPE at "if (Dist1[I] <= Dist2[J])"
>   (Dist1[6] and Dist2[6] are float)

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